/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.datayoo.moql;


/**
 * 
 * @author Tang Tadin
 * 若结果列中的数据没有重载Object的hashCode方法及equals方法
 * 则无法进行正常的DISTINCT及GROUP计算。如：数组、链表等
 */
public interface Selector  {
  
  void setAlias(String alias);
  
  String getAlias();
	
	SelectorDefinition getSelectorDefinition();
	
	void select(DataSetMap dataSetMap);
	
	RecordSet getRecordSet();
	
	void clear();
	
	SelectorContext getSelectorContext();
	
	void setSelectorContext(SelectorContext context);
}
